diff --git a/kombu/transport/azureservicebus.py b/kombu/transport/azureservicebus.py
index 80fdb2dd0..35e689d2e 100644
--- a/kombu/transport/azureservicebus.py
+++ b/kombu/transport/azureservicebus.py
@@ -148,13 +148,8 @@ def _try_parse_connection_string(self) -> None:
         if ":" in self._credential:
             self._policy, self._sas_key = self._credential.split(':', 1)
 
-        # Convert
-        endpoint = 'sb://' + self._namespace
-        if not endpoint.endswith('.net'):
-            endpoint += '.servicebus.windows.net'
-
         conn_dict = {
-            'Endpoint': endpoint,
+            'Endpoint': 'sb://' + self._namespace,
             'SharedAccessKeyName': self._policy,
             'SharedAccessKey': self._sas_key,
         }
@@ -451,6 +446,9 @@ def parse_uri(uri: str) -> tuple[str, str | DefaultAzureCredential |
         # > 'rootpolicy:some/key',  'somenamespace'
         credential, namespace = uri.rsplit('@', 1)
 
+        if not namespace.endswith('.net'):
+            namespace += '.servicebus.windows.net'
+
         if "DefaultAzureCredential".lower() == credential.lower():
             if DefaultAzureCredential is None:
                 raise ImportError('Azure Service Bus transport with a '
diff --git a/t/unit/transport/test_azureservicebus.py b/t/unit/transport/test_azureservicebus.py
index 023099326..9488e9cab 100644
--- a/t/unit/transport/test_azureservicebus.py
+++ b/t/unit/transport/test_azureservicebus.py
@@ -103,8 +103,11 @@ def get_queue_runtime_properties(self, queue_name):
 
 URL_NOCREDS = 'azureservicebus://'
 URL_CREDS_SAS = 'azureservicebus://policyname:ke/y@hostname'
+URL_CREDS_SAS_FQ = 'azureservicebus://policyname:ke/y@hostname.servicebus.windows.net'  # noqa
 URL_CREDS_DA = 'azureservicebus://DefaultAzureCredential@hostname'
+URL_CREDS_DA_FQ = 'azureservicebus://DefaultAzureCredential@hostname.servicebus.windows.net' # noqa
 URL_CREDS_MI = 'azureservicebus://ManagedIdentityCredential@hostname'
+URL_CREDS_MI_FQ = 'azureservicebus://ManagedIdentityCredential@hostname.servicebus.windows.net' # noqa
 
 
 def test_queue_service_nocredentials():
@@ -133,6 +136,7 @@ def test_queue_service_sas():
         # Ensure that queue_service is cached
         assert channel.queue_service == 'test'
         assert m.from_connection_string.call_count == 1
+        assert channel._namespace == 'hostname.servicebus.windows.net'
 
 
 def test_queue_service_da():
@@ -142,6 +146,7 @@ def test_queue_service_da():
     # Check the DefaultAzureCredential has been parsed from the url correctly
     # and the credential is a ManagedIdentityCredential
     assert isinstance(channel._credential, DefaultAzureCredential)
+    assert channel._namespace == 'hostname.servicebus.windows.net'
 
 
 def test_queue_service_mi():
@@ -151,6 +156,7 @@ def test_queue_service_mi():
     # Check the ManagedIdentityCredential has been parsed from the url
     # correctly and the credential is a ManagedIdentityCredential
     assert isinstance(channel._credential, ManagedIdentityCredential)
+    assert channel._namespace == 'hostname.servicebus.windows.net'
 
 
 def test_conninfo():
@@ -450,14 +456,14 @@ def test_basic_ack_reject_message_when_raises_exception(
 
 def test_returning_sas():
     conn = Connection(URL_CREDS_SAS, transport=azureservicebus.Transport)
-    assert conn.as_uri(True) == URL_CREDS_SAS
+    assert conn.as_uri(True) == URL_CREDS_SAS_FQ
 
 
 def test_returning_da():
     conn = Connection(URL_CREDS_DA, transport=azureservicebus.Transport)
-    assert conn.as_uri(True) == URL_CREDS_DA
+    assert conn.as_uri(True) == URL_CREDS_DA_FQ
 
 
 def test_returning_mi():
     conn = Connection(URL_CREDS_MI, transport=azureservicebus.Transport)
-    assert conn.as_uri(True) == URL_CREDS_MI
+    assert conn.as_uri(True) == URL_CREDS_MI_FQ